HI, everyone, when I run the following two command : IDL> a=obj_new('idl_idlbridge') IDL> a->execute,'print,"iloveIDL"',/nowait i come across % Attempt to call undefined method: 'IDL_IDLBRIDGE::ExecuteTimer'. % Execution halted at: $MAIN$. I have test it on various machine, and found that it can be run through without problem on some machine. I donot konw why. The Idl version I have test is 7.1.1 and 7.0.6. My OS is linux. Thank you very much for your attention.